Frost-proof fire-extinguishing liquid.



- UNITED s-rA Es PATENT OFFICE.

MAX BRESLAUER, OF GHARL'OTTENBURQ GERMANY, ASSIGNOR TO THE FIRM OF W. GRAAFF &

COMPAGNIE GES. MIT BESCHR. HAFTUNG, OF BERLIN, GERMANY.

FROST-PROOF FIRE-EXTINGUISHING LIQUID.

Specification of Letters Pat ent.

Patented March 2, 1909.

Application filed November 9, 1906. Serial No. 342,668.

I ,ingliquid which is distinguished by strongly fire extinguishing properties and which is also proof against r eezing at very lowtemperaturesin winter of about 45 to about 50 degrees C. below zero. The fire extinguishmg liquid, which may be thrown upon the hearth of a fire by any available means, consists of a solution of acetate of alkali, for instance of alsolution of acetate of ammonia in water.v To this solution an addition of glycerin may be made, which however is not absolutely necessary.

The acetates of. alkali possess the very important property of adapting themselves completely to the conditions prevailing in the case of chemical fire extinguishers.

The fire extinguishers of known construe-1 tion, present the inconvenience of freezin 'up at low temperatures, so that they Wlll then be unavailable in case of need. It has not been possible heretofore to remedy this difficulty, inasmuch as the substances to'be used in this connection are either apt to form compounds with thechemical solutions contained in the apparatus, which greatly interfere with the operation of the fire extinguishing apparatus even making it inoperative, or the substances in question are inflammable themselves and are apt to produce deleterious results when pro ected upon timber or houses on fire.

The knovm chemical fire extinguishers are filled generally with a soda solution, to which an acid, in t e majority of cases, muriatic acid is added, when the apparatus is to be used in order to generate carbonic acid, and to produce the pressure upon the fluid for this class of apparatus. Now, chlorid of lime for instance'might be considered as a substance adapted to prevent freezing of the fire extinguishing liquid, yet, this substance is entirely unfit for use in apparatus of the kind described, in view of the fact that carbonate of lime would be precipitated by the tion and would choke the apertures of the extinguisher, however, the use of this agent would be out of the question on account of its strongly hygrosco icproperties, for when this agent is projecte upon urning timbers, jointly with the ordinary fire extinguishing liquid, it would be a cause for the production of dry rot in buildings. The acetates of alkali, the acetate of ammonia for instance, on the other hand are well adapted for use in connection with the soda solution. Without giving rise to precipitates, they rendersaid solution entirely frost proof even at a temperature of about 45 degrees to about 50 degrees C. below zero, without any possibility of the apparatus getting clog ed up and without depriving the solution 0% its property of generating carbonic acid by reaction with the muriatic acid. Moreover, the fire extinguishing property of the fire extinguishing liquid of the chemical fire extinguishers is ver considerably of t e acetates of alkali. 1

In charging an ordinary chemical fire extinguishing apparatus I use bicarbonate of soda 0.67 kg. acetate of ammonia 13.33 kg. water 10 liters. I can add to this solution 3.33 liters of glycerin but it is not absolutely necessary.

Having thus described my invention what I claim is 1. Frost-proof fire extinguishing'liquid which consists of a solution of acetate of alkali andbicarbonate of alkali in water in the proportions s eoified.

2. Frost-prod fire extin uishing liquid which consists of a solution 0% acetate of ammonia and bicarbonate of soda in water in MAX BRESLAUER. Witnesses HENRY HASPER, W OLDEMAR HAUPT.

increased by the addition addition of chlorid of lime to the soda solu- 

